Buggy code:
public class SourceType extends NamedMember implements IType { protected SourceType ( JavaElement parent , String name ) { } protected void closing ( Object info ) throws JavaModelException { } public void codeComplete ( char [ ] snippet , int insertion , int position , char [ ] [ ] localVariableTypeNames , char [ ] [ ] localVariableNames , int [ ] localVariableModifiers , boolean isStatic , ICompletionRequestor requestor ) throws JavaModelException { } public void codeComplete ( char [ ] snippet , int insertion , int position , char [ ] [ ] localVariableTypeNames , char [ ] [ ] localVariableNames , int [ ] localVariableModifiers , boolean isStatic , ICompletionRequestor requestor , WorkingCopyOwner owner ) throws JavaModelException { } public void codeComplete ( char [ ] snippet , int insertion , int position , char [ ] [ ] localVariableTypeNames , char [ ] [ ] localVariableNames , int [ ] localVariableModifiers , boolean isStatic , CompletionRequestor requestor ) throws JavaModelException { } public void codeComplete ( char [ ] snippet , int insertion , int position , char [ ] [ ] localVariableTypeNames , char [ ] [ ] localVariableNames , int [ ] localVariableModifiers , boolean isStatic , CompletionRequestor requestor , WorkingCopyOwner owner ) throws JavaModelException { } public IField createField ( String contents , IJavaElement sibling , boolean force , IProgressMonitor monitor ) throws JavaModelException { } public IInitializer createInitializer ( String contents , IJavaElement sibling , IProgressMonitor monitor ) throws JavaModelException { } public IMethod createMethod ( String contents , IJavaElement sibling , boolean force , IProgressMonitor monitor ) throws JavaModelException { } public IType createType ( String contents , IJavaElement sibling , boolean force , IProgressMonitor monitor ) throws JavaModelException { } public boolean equals ( Object o ) { } public IMethod [ ] findMethods ( IMethod method ) { } public IType getDeclaringType ( ) { } public int getElementType ( ) { } public IField getField ( String fieldName ) { } public IField [ ] getFields ( ) throws JavaModelException { } public String getFullyQualifiedName ( ) { } public String getFullyQualifiedName ( char enclosingTypeSeparator ) { } public String getFullyQualifiedParameterizedName ( ) throws JavaModelException { } public IJavaElement getHandleFromMemento ( String token , MementoTokenizer memento , WorkingCopyOwner workingCopyOwner ) { } public IInitializer getInitializer ( int count ) { } public IInitializer [ ] getInitializers ( ) throws JavaModelException { } public String getKey ( ) { try { <START_BUG> return getKey ( this , true , false ) ; <END_BUG> } catch ( JavaModelException e ) { return null ; } } public IMethod getMethod ( String selector , String [ ] parameterTypeSignatures ) { } public IMethod [ ] getMethods ( ) throws JavaModelException { } public IPackageFragment getPackageFragment ( ) { } public IJavaElement getPrimaryElement ( boolean checkOwner ) { } public String getSuperclassName ( ) throws JavaModelException { } public String getSuperclassTypeSignature ( ) throws JavaModelException { } public String [ ] getSuperInterfaceNames ( ) throws JavaModelException { } public String [ ] getSuperInterfaceTypeSignatures ( ) throws JavaModelException { } public ITypeParameter [ ] getTypeParameters ( ) throws JavaModelException { } public String [ ] getTypeParameterSignatures ( ) throws JavaModelException { } public IType getType ( String typeName ) { } public ITypeParameter getTypeParameter ( String typeParameterName ) { } public String getTypeQualifiedName ( ) { } public String getTypeQualifiedName ( char enclosingTypeSeparator ) { } public IType [ ] getTypes ( ) throws JavaModelException { } public boolean isAnonymous ( ) { } public boolean isClass ( ) throws JavaModelException { } public boolean isEnum ( ) throws JavaModelException { } public boolean isInterface ( ) throws JavaModelException { } public boolean isAnnotation ( ) throws JavaModelException { } public boolean isLocal ( ) { } public boolean isMember ( ) { } public boolean isResolved ( ) { } public ITypeHierarchy loadTypeHierachy ( InputStream input , IProgressMonitor monitor ) throws JavaModelException { } public ITypeHierarchy loadTypeHierachy ( InputStream input , WorkingCopyOwner owner , IProgressMonitor monitor ) throws JavaModelException { } public ITypeHierarchy newSupertypeHierarchy ( IProgressMonitor monitor ) throws JavaModelException { } public ITypeHierarchy newSupertypeHierarchy ( ICompilationUnit [ ] workingCopies , IProgressMonitor monitor ) throws JavaModelException { } public ITypeHierarchy newSupertypeHierarchy ( IWorkingCopy [ ] workingCopies , IProgressMonitor monitor ) throws JavaModelException { } public ITypeHierarchy newSupertypeHierarchy ( WorkingCopyOwner owner , IProgressMonitor monitor ) throws JavaModelException { } public ITypeHierarchy newTypeHierarchy ( IJavaProject project , IProgressMonitor monitor ) throws JavaModelException { } public ITypeHierarchy newTypeHierarchy ( IJavaProject project , WorkingCopyOwner owner , IProgressMonitor monitor ) throws JavaModelException { } public ITypeHierarchy newTypeHierarchy ( IProgressMonitor monitor ) throws JavaModelException { } public ITypeHierarchy newTypeHierarchy ( ICompilationUnit [ ] workingCopies , IProgressMonitor monitor ) throws JavaModelException { } public ITypeHierarchy newTypeHierarchy ( IWorkingCopy [ ] workingCopies , IProgressMonitor monitor ) throws JavaModelException { } public ITypeHierarchy newTypeHierarchy ( WorkingCopyOwner owner , IProgressMonitor monitor ) throws JavaModelException { } public JavaElement resolved ( Binding binding ) { } public String [ ] [ ] resolveType ( String typeName ) throws JavaModelException { } public String [ ] [ ] resolveType ( String typeName , WorkingCopyOwner owner ) throws JavaModelException { } protected void toStringInfo ( int tab , StringBuffer buffer , Object info , boolean showResolvedInfo ) { } }

Fix:
return getKey ( this , false ) ;